Switch for first degree atrioventricular block
Tracing
Manufacturer Microport CRM
Device PM
Field SafeR mode
N° 1
Patient
- 65-year-old man
- Reply DR pacemaker (Microport CRM-Sorin) for sinus dysfunction
- SafeR algorithm
- Programmed value for long PR 350 ms (AR 450 ms)
- Episodes of switch to DDD for first degree AV block (AVB1) recorded in AIDA (memory of the device)
Graph and trace
- Atrial pacing with ventricular sensing (AR)
- AR intervals between 367 and 406 ms (less than the programmed value)
- Prolongation of the AR intervals (> 450 ms)
- After 6 consecutive cycles with AR interval > 450 ms, switch to DDD (vertical line)
- Atrial and ventricular pacing
Comments
- The device switches to DDD when PR or AR intervals are longer than the programmed maximum programmable value during 6 consecutive cycles
- Only the long PR (sensed atrial activity) interval is programmable
- The long AR value (paced atrial activity) = long PR + 100 ms
- The AVB I (first degree AV block) criterion can be programmed to: rest + exercise (the device may switch to DDD during rest and exercise phases) or to exercise only (the device may switch to DDD during exercise phase only)
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